]>
Commit | Line | Data |
---|---|---|
1d09f67e TL |
1 | // Licensed to the Apache Software Foundation (ASF) under one or more |
2 | // contributor license agreements. See the NOTICE file distributed with | |
3 | // this work for additional information regarding copyright ownership. | |
4 | // The ASF licenses this file to You under the Apache License, Version 2.0 | |
5 | // (the "License"); you may not use this file except in compliance with | |
6 | // the License. You may obtain a copy of the License at | |
7 | // | |
8 | // http://www.apache.org/licenses/LICENSE-2.0 | |
9 | // | |
10 | // Unless required by applicable law or agreed to in writing, software | |
11 | // distributed under the License is distributed on an "AS IS" BASIS, | |
12 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | // See the License for the specific language governing permissions and | |
14 | // limitations under the License. | |
15 | ||
16 | using Apache.Arrow.Memory; | |
17 | using System.IO; | |
18 | using System.Threading; | |
19 | using System.Threading.Tasks; | |
20 | ||
21 | namespace Apache.Arrow.Ipc | |
22 | { | |
23 | /// <summary> | |
24 | /// Implements an <see cref="ArrowStreamReader"/> that can read Arrow files. | |
25 | /// </summary> | |
26 | public class ArrowFileReader : ArrowStreamReader | |
27 | { | |
28 | private ArrowFileReaderImplementation Implementation => | |
29 | (ArrowFileReaderImplementation)_implementation; | |
30 | ||
31 | public bool IsFileValid => Implementation.IsFileValid; | |
32 | ||
33 | public ArrowFileReader(Stream stream) | |
34 | : this(stream, leaveOpen: false) | |
35 | { | |
36 | } | |
37 | ||
38 | public ArrowFileReader(Stream stream, MemoryAllocator allocator) | |
39 | : this(stream, allocator, leaveOpen: false) | |
40 | { | |
41 | } | |
42 | ||
43 | public ArrowFileReader(Stream stream, bool leaveOpen) | |
44 | : this(stream, allocator: null, leaveOpen) | |
45 | { | |
46 | } | |
47 | ||
48 | public ArrowFileReader(Stream stream, MemoryAllocator allocator, bool leaveOpen) | |
49 | : base(new ArrowFileReaderImplementation(stream, allocator, leaveOpen)) | |
50 | { | |
51 | } | |
52 | ||
53 | public static ArrowFileReader FromFile(string filename) | |
54 | { | |
55 | var stream = new FileStream(filename, FileMode.Open, FileAccess.Read); | |
56 | return new ArrowFileReader(stream); | |
57 | } | |
58 | ||
59 | public ValueTask<int> RecordBatchCountAsync() | |
60 | { | |
61 | return Implementation.RecordBatchCountAsync(); | |
62 | } | |
63 | ||
64 | public ValueTask<RecordBatch> ReadRecordBatchAsync(int index, CancellationToken cancellationToken = default) | |
65 | { | |
66 | return Implementation.ReadRecordBatchAsync(index, cancellationToken); | |
67 | } | |
68 | } | |
69 | } |